Pump



Patented Apr. 30, 1935 UNITED STATES PATENT OFFICE PUMP.

Leonidas Coyle, Trenton, N. J. Application october '3, 1932, serai No. `535,899

' a claims. (ol. 10s- 188) 'I'hisinvention relates toapump and, moreparliquid supply, not shown. Such a source .of supticularly, Ito that class of pump which is designed ply may, for instance, consist of a tank of several to he carried by an operator who also transports n gallons capacity arranged to be supported on the a supply of liquid for the purpose of re fighting, back of the operator. A tank of this kind is in tree or plant spraying, etc. common use in connection with the care of forest 5 Ithas foranobject to provide certain improve-v preserves, and .it may contain water for the ments whereby, during operation, the ejection of quenching of incipient fires or :a chemical for exliquid is very forcible and substantially continuterminating vermin, nl* Other desired liquid. ous rather than spasmodic. ,Y The nipple i is tted to be threaded on the Another object consists inproviding certainimbuie-Dieee ilheil has POIQUS 3 Wheh are Opened 10 proveniente whereby, during operation, ,air is and closed the Operatn of the Dump by trapped and held in the pump, unaiected by the lille action-0f a Valve 4 'that iS freely mounted O11 ,position of the pump, so that a, substantially con.. the stem of a screw 5 which is threaded into the sta-nt nozzle pressure is provided and the liquid buit-piece? ii'efmediae the' DUNS 3- A Cylinder i5 is ejected in a substantially continuous and near; 6 which may, for instance. 'be composed of drawn 15 1y uniform Stream, tubular metal is Athreaded. onto the 'butt-piece 2 at Another object consists in providing certain im- One end, `end i135 OPDDSiGe end iS threaded onto a movements whereby the pump may be Operated sleeve ,'i. A Vportion of 'the cylinder 15, adjacent Y with the hand that grasps the end thereof Vwhich the Sleeve 1. iS arlllulnrlyv indented to PTOVide an is away from the 1102215, usually the right, handJ interior `shoulder 2, and a pair of washers Si, to- 2o with the result that the operation is more facile gethel With Decking i0, are interposed between and swaying of the nozzle or ejection end, with said shoulder and the adjacent end of sleeve 1. consequent inaccuracy of stream direction, is A Shell ii has e Sliding iii? Within sieeVe i', avoided. v washers 9 and packing HJ. Its inner end is Another object consists in providing certain threaded ini/U e pieten :11 located 'Within cylinder 25 improvements whereby seepage of the liquid :from 5- The Seid Pieten iS provided with a Series of the source of supply into and through the pump, DONS i3 Whieh are arranged t0 be Opened and when out gf usea is gvoidei FOSGCL during S eciplati, by a Valve M that kAnother vobjet ,Consists in providing certain is loosely mounted on .screw l5 which is threaded 3o improvements the form, construction .and ar- 111150131500 i-Ceniileliy of ports I3. 30

rangement of the several parts, whereby the above The Other end 0f Shell i l iS threaded into a Cep named and other yobjects may effectively he ob- 15 at 4the iront or ejection end of the hump tained, A tube i6 is located within shell I1 and held Apractieal embodiment of the inventionis repin spaced relation thereto by Spacing rings ii, resented in the accompanying drawing, in which I8 located adjacent the inner and outer ends 35 Fig. 1 represents a side elevation of the pump, ieepeeiiyeiy- These Faris may Tee Secured t0- the parts being shown in different positions in gether by a friction engagement, O1 by bieZIlg, full and in dotted and in dash-and-dotted lines; 0I in any Other desired mail-nel".

Fig. 2 represents a broken side view, partly in A Series 0f radially diSpOSed DONS i9 fOrmed in 40 section, on an enlarged scale; the tube I6 intermediate its ends opens communi- 4o Fig. 3 represents a broken longitudinal section cation between the interior of said tube and the on the same scale as Fig. 2; annular space between the tube and shell l i.

Fig. 4 represents a transverse section taken in A Suitable IlOZZie 20 iS threaded 011110 Cep i5, the plane of the line IV-IV of Fig. 3, looking in and its engagement therewith made water tight the direction of the arrows; by a Washer 2|. 45

Fig. 5 represents a transverse section taken in In OPeIeiiOIl, end assuming the apparatus G0 be the plane of the line V-V of Fig. 3, looking in the used by a forest preserve re ghter, the nipple I direction of the arrows; and is connected by hose to a tank carried on the back Fig. 6 represents a transverse section taken in Of the ODeIeOI' The hOSe iS 10mg el'lOllgh t0 Del"- the pane of the une v1-v1 of Fig. 3, poking in mit the pump to be held in the hands in fron-t 50 the direction of the arrows. of the operator. When the latter desires to eject The pump comprises an intake nipple denoted the liquid, he seizes the cylinder 6 with one hand by I,which may be of any Well known or approved and the shell Il with another, and reciprocates form, and which is intended to be connected by a the parts by moving the cylinder. The hand on hose, or the like, shown in Fig. 1, with a source of the shell Il serves to guide the stream. The in- 55 active position of the parts when out of use, is represented in Fig. 2 and in dotted lines in Fig. 1, so that the rst movement of repicrocation is to move the cylinder 6 away from shell II as indicated in Fig. 3. This forms a partial vacuum within the cylinder 6 at the rear of piston I2, which vacuum opens valve 4 and causes fluid to be sucked in through the hose and nipple I from the tank, not shown. At this stage valve I4 is, of course, closed by the partial vacuum. n

In the reverse movement of. the parts, the compression of the liquid within cylinder 6' closes valve d and opens valve I4. This causes the liquid to pass from cylinder 5 into tube I6 and be ejected through nozzle 20. A part of the liquid compressed within tube I6 at this stage escapes through ports I9 into the annular space between tube l5 and shell I I, which escaping liquid com-` presses the air located in said annular space. When the parts are again moved so as to draw in an additional supply ofv liquid from the tank, which movement naturally relieves the pressure within tube I5 and wound ordinarily cause an interruption in ejection of uid from the nozzle, the air that has been compressed in the annular space between tube IG and shell I I forces the liquid therein back through ports I9 intotube I 6 and ejects the same throughthe nozzle, thereby preventing an interruption in ejection.

It will be understood that the parts are intended to be operated with reasonable rapidity so that there is only a short interval between the ejection strokes, and I have found that the action of the compressed air in the space between tube i and shell I I is suiiicient to compensate for the said interval and to maintain, with substantial uniformity, a continuous ejection stream. This'is a particular advantage in fighting incipient fires and is an advantage from the point of View of economy of time and effort in all situations. VNot only is the stream continuous, but it is very poweriul and it has been found that, in actual trial, the stream may be ejected to an extraordinary distance for a device of this character.

When the parts are in the idle position indicated in Fig. 2 of the drawing, it will be observed that the piston I2 abuts valve 4 and holds it against ports This prevents seepage of the liquid from the tank through the pump and the loss` thereof. The avoidance of such seepage is of importance from the point of view of convenience to the operator and also from the point of View of conserving theY supply of liquid which is necessarily limited in the case of a tank carried by an operator.

It will be understood that various changes may be resorted to in the form, construction and a1'- rangement of the several parts without departing from the spirit and scope of my invention; and hence I do not intend to be limited to the details herein shown and described, except as they may be included in the claims.

What I claim is:

l. A device of the character described comprising, a cylinder, a piston fitted to reciprocate in the cylinder, a tubular shell connected to the piston, a nozzle connected to the shell, a tube within the shell connected to the piston and the nozzle and spaced from the shell so as to form a. chamber between it and the shell, ports intermediate the ends of the tube opening communication to the chamber, said ports being suiliciently removed from the ends of said tube to provide an air chamber of relatively large volume selectively at either y,end thereof dependent on the position of the device, and a valve in the piston for intermittently opening communication between the cylinder andthe tube, whereby liquid may be forced from the cylinder into the tube and through the ports into said chamber against the conned air therein during an ejection movement and ejected from the chamber through the ports into the tube and through the nozzle by said confined air during a suction movement of` the members.

2. A Ydevice of the character described comprising, reciprocable members, a nozzle port on one of said reciprocable members, a storage chamber carried by said nozzle-ported reciprocable member, and a communicating passageway between said storage chamber and said nozzleported reciprocable member, said passageway being surliciently removed from the ends of said chamber to provide an air chamber of relatively large volume selectively at either end thereof *dependenton the position of the device.

3. A device of the character described comprising, two reciprocable members,` a nozzle port on one of said reciprocable members, a storage chamber carried by said nozzle-ported reciprocable member, a communicating passageway between said storage chamber and said nozzleported reciprocable member, said passageway being suiciently removed from the ends of said chamber toprovide an air chamber of relatively large volume selectively at either end thereof dependent on the position of the device, a suction port in the other of said reciprocable members, a check valve positioned at said suction port, and means onI the other of said reciprocable members for holding said check valve closed.

` LEONIDAS COYLE. 

